Unknown Story
Text z Príbehu
- HOW TO DETERMINE THE APPROPRIATE TOOL WHEN:VARIANCE IS UNKNOWN
- When the population variance is unknown, however, the t-test is the proper test statistic to apply.
- HOW TO DETERMINE THE APPROPRIATE TOOL WHEN:VARIANCE IS UNKNOWN
- A t-test is an inferential statistic that is used to see if there is a significant difference between the means of two groups that are similar in some ways.
- HOW TO DETERMINE THE APPROPRIATE TOOL WHEN:VARIANCE IS UNKNOWN
- REMEMBER: T-test is the appropriate tool to used when:The population standard deviation (σ) is unknownThe sample dstandard deviation (s) is knownThe population is normal or nearly normally distributedThe sample size is less than 30 (n30)
- Finally, when the Central Limit Theorem is used, the appropriate test statistic is z-test, with population standard deviation (σ) replaced by sample standard deviation (s) in the formula.
- HOW TO DETERMINE THE APPROPRIATE TOOL WHEN:CENTRAL LIMIT THEOREM
- REMEMBER: Z-test is the appropriate tool to used in central limit theorem when:The population is normally distributed or the sample size is large and the true population means μ=μ0,the z has a standard normal distributionThe sample size is extremely large and the variance (σ2) is known or unknownThe sample standard deviation (σ) when the value of σ is unknown
- HOW TO DETERMINE THE APPROPRIATE TOOL WHEN:CENTRAL LIMIT THEOREM
- Z-test T-test n30,σ is known n30,σ is not knownn30,σ is unknown n30,s is known(Central Limit Theorem) n30,σ is known
- That is all for our lesson. Thank you for listening and see you next time!
Bolo vytvorených viac ako 30 miliónov storyboardov
Na Vyskúšanie nie je Potrebné Žiadne Sťahovanie, Žiadna Kreditná Karta a Žiadne Prihlásenie!
